package com.atguigu.gulimall.gateway.config;

import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.BlockRequestHandler;
import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.GatewayCallbackManager;
import com.alibaba.fastjson.JSON;
import com.atguigu.common.exception.BizCodeEnum;
import com.atguigu.common.utils.R;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * Sentinel网关限流回调配置
 *
 * @author: kaiyi
 * @create: 2020-09-18 00:21
 */

@Configuration
public class SentinelGatewayConfig {

  public SentinelGatewayConfig(){
    GatewayCallbackManager.setBlockHandler(new BlockRequestHandler() {

      /**
       * 网关限流了请求，就会调用此回调
       *  Mono Flux
       * @param serverWebExchange
       * @param throwable
       * @return
       */
      @Override
      public Mono<ServerResponse> handleRequest(ServerWebExchange serverWebExchange, Throwable throwable) {

        R error = R.error(BizCodeEnum.TOO_MANY_REQUEST.getCode(), BizCodeEnum.TOO_MANY_REQUEST.getMsg());
        String errJson = JSON.toJSONString(error);

        Mono<ServerResponse> body = ServerResponse.ok().body(Mono.just(errJson), String.class);
        return body;
      }
    });
  }

}
